# If z1

Given: z1 = (2 – i) and z2 = (1 + i)

To find:

Consider,

Putting the value of z1 and z2, we get

Now, rationalizing by multiply and divide by the conjugate of 1 – i

[(a – b)(a + b) = a2 – b2]

[Putting i2 = -1]

= |2(1 + i)|

= |2 + 2i|

Now, we have to find the modulus of (2 + 2i)

So,

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